nebulous

他的计划还很模糊，没有具体的细节。

His plan is still ___nebulous, lacking any concrete details.

他对事故模糊不清的回忆让警方很难拼凑出事情的完整经过。

His ___nebulous recollection of the accident made it hard for the police to piece together the events.

这位小说家从一个关于宽恕的模糊想法开始，慢慢将它凝练成了一个完整的情节。

The novelist started with a ___nebulous idea about forgiveness that slowly crystallized into a plot.